Someone has probably already said this, but LAPD used CB750As for a while. Yep, automatics. During the 70s I serviced LAPD 750s for a dealer in North Hollywood. However, here's some stuff you probably didn't know. First, municipal PDs that use motorcycles usually give their officers a lot of freedom in how they are serviced. They can take them home and service them themselves, they can take them to the dept. shop (if there is one and it is set up for bikes), or they can take it to a dealer, which most of them chose to do. Also, practically all of the painting and electrical set up on each bike is done by the indvidual PDs, not by the manufacturer, the exception being the KZ1000P which came from Japan already painted black and white (and was discontinued two years ago). The electrical work done on the bikes is the biggest problem they have. The PDs farm it out to other vendors, and the result is something to give you nightmares as a mechanic, believe me.
I once was working on a 750A while the officer stood watching (very typical). I tipped the tank up, soe fuel ran out of the cap, and the special paint job on his tank promptly ran all over the place. Was not a good thing. Anoher time, I was test riding a KZ1000P for a Kawasaki shop. The clutch cable broke during the test ride, so I started pushing it back to the shop. Just a block later, I was surrounded by police cars with officers crouched behind their doors. What a scene!
Working on police bikes is probably the least enjoyable part of being a mc mechanic.